. 2011 Feb 9;17(2):131–135. doi: 10.1136/ip.2010.028696

Table 4.

Crash RR from Wachtel and Lewiston²² data with non-intersection crashes included^*

	Sidewalk		Roadway		All		RR, sidewalk versus in-street (95% CI)^†	p Value^‡
	Riders	Crashes	Riders	Crashes	Riders	Crashes	RR, sidewalk versus in-street (95% CI)^†	p Value^‡
Intersection only^§
All cyclists	971	41	2005	48	2976	89	1.76 (1.16 to 2.68)	0.01
Bicycling in same direction as closest traffic lane	656	13	1897	43	2553	56	0.87 (0.47 to 1.63)	0.56
All crashes^¶
All cyclists	971	41	2005	79	2976	120	1.07 (0.73 to 1.56)	0.79
Bicycling in same direction as closest traffic lane	656	13	1897	71	2553	84	0.53 (0.29 to 0.96)	0.02

Statistically significant comparisons are shown in bold.

^†

95% CI calculated using the variance of log(IRR) based on a Poisson distribution.

^‡

Significance, calculated using the variance of log(IRR) based on a Poisson distribution (for comparison with original article).

^§

Authors' original data.

^¶

Non-intersection crashes amounting to 26% of total crashes added to roadway crashes.